Net frame



FIG. 1 is a perspective view of a net frame showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a side perspective view thereof; and,

FIG. 6 is a front view thereof.

The dashed lines shown in the drawings are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a net frame, as shown and described. 